National Item Identification Number
01-048-1431
010481431
5210-01-048-1431
5210010481431
National Stock Number
Item Name
OPTICAL FLAT
Federal Supply Class
5210
Description
A flat, transparent piece of glass, generally of fused quartz, with one or both principal surfaces polished to within a few millionths of an inch of a true plane. It is used in conjunction with a monochromatic light source to measure the flatness of precision finished surfaces, and to determine the distance and parallelism between precision finished surfaces by comparison with known standards. In operation the flat is superimposed, reference surface downward, on the parts under test and when illuminated by monochromatic light the rays reflected from the reference surface are either reinforced or neutralized by the rays reflected from the surface under test producing interference bands which reveal any variations in the thickness of the film of air between surface under test and the flat. Excludes optical parallels.
Commercial and Government Entity Code (Supplier Data)
63797
SIGMA DYNAMICS CORP
11 BRENTWOOD DR
WILLOW GROVE
PA
19090
215-784-0500
Reference Numbers (Part Numbers)
8044-120
Required Categories
MATERIAL
DIAMETER
THICKNESS
CASE
THE MANUFACTURERS DATA
MANUFACTURERS CODE;
Required Description
GLASS, BOROSILICATE CROWN
1.700 INCHES NOMINAL
0.062 INCHES NOMINAL
NOT PROVI